A lot of 20 bulbs contain 4 defective ones. One bulb is drawn at random from the lot. What is the probability that this bulb is defective? Suppose the bulb is drawn is previous case is not defective and is not replaced. Now one bulb is drawn at random from the rest. What is the probability that this bulb is not defective?

A lot of 20 bulbs contain 4 defective ones. One bulb is selected at random from the lot. What is the probability that this bulb is defective? Suppose the bulb selected in previous case is not defective and is not replaced. Now one bulb is selected at random from the rest. What is the probability that this bulb is not defective?

A lot of 40 bulbs contain 10 defective one. One bulb is selected at random from the lot what is the probability that. This bulb is defective? Suppose the bulb selected in previous case in not defective and is not replaced. Now one bulb is selected at random. from the test what is the probability that this bulb is not defective.

A bag contains 3 red balls and 5 black balls. A ball is drawn at random from the bag. What is the probability that the ball drawn is red?

A bag contains 3 red balls and 5 black balls. A ball is drawn at random from the bag. What is the probability that the ball drawn is not red?

A box contains 4 defective and 6 good bulbs. Two bulbs are drawn at random without replacement. Find the probability that the both the bulbs drawn are good.

A box contains 100 electric bulbs. Out of them, 10 are defective bulbs. One bulb is taken out at random from this box. What is the probability that it is a non-defective bulb?

A box contains 3 blue,2 white and 4 red marbles. IF a marble is drawn at random from the box, what is the probability that it will be white?

A box contains 3 blue,2 white and 4 red marbles. IF a marble is drawn at random from the box, what is the probability that it will be red?

A bag contains 4 black balls and 6 red balls. One ball is drawn at random. The probability that it is red is